How much sugar is really in your milkshake? Toby Carvey's Unicorn Freakshake is named wost offender with a 'grotesque' 39 teaspoons worth and weighs in at 1,280 calories (more than four times what public health officials advise)

Campaigners surveyed 140 products from 14 food chains and found all had excessive sugar as defined by the Food Standards Agency traffic light system.

Action On Sugar said: ‘Milkshakes sold across high street restaurants and fast food chains contain grotesque levels of sugar.’ Toby Carvery and Harvester are owned by Mitchells & Butlers. A spokesman said both had joined PHE’s sugar reduction scheme. Other chains did not respond to requests for comment.